EP 0934644 A2 19990811 - CONFERENCE CALLING SYSTEM AND METHOD FOR A WIRELESS COMMUNICATIONS CHANNEL
Title (en)
CONFERENCE CALLING SYSTEM AND METHOD FOR A WIRELESS COMMUNICATIONS CHANNEL
Title (de)
KONFERENZANRUFSYSTEM UND VERFAHREN FÜR EINEN DRAHTLOSEN KOMMUNIKATIONSKANAL
Title (fr)
SYSTEME DE CONFERENCE TELEPHONIQUE ET PROCEDE POUR UNE VOIE DE TRANSMISSION SANS FIL
Publication
Application
Priority
- US 9717822 W 19970911
- US 71803996 A 19960913
Abstract (en)
[origin: WO9811709A2] A conference calling system for a wireless communications channel. The system is adapted for use with a channel having first, second and third participants communicating via first (34), second (20) and third (20) transmitters and receivers respectively. The system includes a circuit for receiving an encoded signal (144) from at least one of the transmitters. A second circuit determines (62) which of the participants is speaking from the received encoded signal. A third circuit is provided for re-transmitting (66) an encoded signal received from the speaking participant to the other participants. In the illustrated implementation, the encoded signals are variable rate speech vocoded signals in which speech is vocoded at full rate, silence is vocoded at 1/8th rate and the 1/2 and 1/4 rates are used as transitional rates. In the illustrative implementation, the speaker's signal is identified by examining the rate of the receiving vocoded signals. When the speaker's vocoded signal is identified, it is re-transmitted without de-vocoding to the non-speaking participants in the conference call. By re-transmitting the speaker's signal without de-vocoding, the quality of the received signal is preserved.
IPC 1-7
IPC 8 full level
H04M 3/56 (2006.01); H04W 4/06 (2009.01); H04W 88/02 (2009.01)
CPC (source: EP KR US)
H04M 3/56 (2013.01 - EP KR US); H04M 3/564 (2013.01 - EP US)
Citation (search report)
See references of WO 9811709A2
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9811709 A2 19980319; WO 9811709 A3 19980827; AT E310356 T1 20051215; AU 4606497 A 19980402; AU 722230 B2 20000727; BR 9711469 A 20011016; CA 2265757 A1 19980319; CN 1148939 C 20040505; CN 1237304 A 19991201; DE 69734668 D1 20051222; DE 69734668 T2 20060810; EA 001342 B1 20010226; EA 199900288 A1 19991028; EP 0934644 A2 19990811; EP 0934644 B1 20051116; HK 1022224 A1 20000728; ID 22038 A 19990826; IL 128946 A0 20000217; IL 128946 A 20040601; JP 2001500693 A 20010116; JP 4241931 B2 20090318; KR 20000036125 A 20000626; NO 991215 D0 19990311; NO 991215 L 19990511; NZ 334617 A 19990929; US 5881053 A 19990309
DOCDB simple family (application)
US 9717822 W 19970911; AT 97944605 T 19970911; AU 4606497 A 19970911; BR 9711469 A 19970911; CA 2265757 A 19970911; CN 97199606 A 19970911; DE 69734668 T 19970911; EA 199900288 A 19970911; EP 97944605 A 19970911; HK 00100840 A 20000211; ID 990094 Q 19970911; IL 12894697 A 19970911; JP 51403098 A 19970911; KR 19997002158 A 19990313; NO 991215 A 19990311; NZ 33461797 A 19970911; US 71803996 A 19960913